Capillary Blood Sinusoidal

Sinusoidal blood capillaries are microscopic vessels that are found in the tissues and organs of the human body and perform the important function of transporting oxygen and nutrients to cells. Capillaries are only a few micrometers in diameter and are composed of two layers of endothelial cells that form the capillary wall and are sandwiched between them.

Sinusoidal blood capillaries are sinusoidal in shape, which means they have a wavy shape with irregular areas. This allows them to better adapt to different conditions and needs of the body, providing more efficient transport of substances.

One of the main functions of blood sinusoidal capillaries is the transport of oxygen and carbon dioxide between blood and tissues. The blood passing through the capillaries contains oxygen and other nutrients necessary for the functioning of cells. At the same time, capillaries allow the removal of carbon dioxide, which is formed as a result of metabolism between cells and blood.

In addition, sinusoidal blood capillaries play an important role in regulating body temperature. They regulate the amount of heat that is transferred from the blood to the tissues and provide a balance between the release and absorption of heat by the body.

However, it should be noted that sinusoidal blood capillaries can also be susceptible to various diseases, such as atherosclerosis, thrombosis and others. This can lead to poor circulation and deterioration of capillary function.

Thus, sinusoidal blood capillaries are important elements of the body’s circulatory system and play a key role in maintaining its vital functions. However, they can also be susceptible to various diseases and disorders, which can lead to serious consequences for human health.

Introduction

The capillary circulatory sinusoidal system is structured differently in different animals, and the main difference lies in the ratio of the number of capillaries and the thickness of the endothelium. In fish it is single-layered, and if we take the thickness of the endothelial surface and the cavity of the vessel as a unit, then per one red blood cell in the membrane in this vessel there is only 0.06 - 0.1 µm 2 of true (hydrodynamic) free surface. The thickness of the endothelial surface membrane for mammals is 0.4 - 1.7 microns, for birds - 7 microns. For comparison, it should be noted that the length of a red blood cell is, on average, about 0.5 cm. Although this figure alone is not enough for a clear understanding: it reflects both the diameter of the red blood cell and the number of the latter transported per unit of time.

It is worth noting that dogs and pigs have the smallest endothelial cell diameter among the listed animals, but in sheep and goats its value increases to a value similar to that in pigs and horses. Capillary size (lumen diameter) also varies dramatically, not only within the body, but also between different groups of animals. The diameter of the capillary lumen in a camel is slightly more than 20 microns, and in a bear it is about 60 microns. Data on the internal diameter of the capillary of laboratory mice and rats, in which it ranges from 5 to 15 microns, depending on the degree of contraction or expansion of the lumen of the vessel, are also distinguished by high indicators. The same significant differences are observed in other groups of mammals. In the enteric capillary of domestic animals